$\overrightarrow{\mathbf{P}}$ ও $\overrightarrow{\mathbf{Q}}$ সমতলীয় ভেক্টরদ্বয়ের উলম্ব দিকে একক ভেক্টর কোনটি?

$\overrightarrow{\mathrm{P}}+\overrightarrow{\mathrm{Q}}$

$\frac{\overrightarrow{\mathrm{P}}+\vec{Q}}{|\overrightarrow{\mathrm{P}}+\vec{Q}|}$

$\overrightarrow{\mathrm{P}} \times \overrightarrow{\mathrm{Q}}$

$\frac{\overrightarrow{\mathrm{P}} \times \overrightarrow{\mathrm{Q}}}{|\overrightarrow{\mathrm{P}} \times \overrightarrow{\mathrm{Q}}|}$